Police in Northern California say two teens drugged the milkshakes of one girl's parents so they could go online after 10 p.m., which was forbidden. / Susan Tusa, Detroit Free Press

by Michael Winter, USA TODAY

by Michael Winter, USA TODAY

Two California teenagers are accused of drugging the milkshakes of one girl's parents so they could use the Internet after 10 p.m., according to news reports.

The 15- and 16-year-old girls, from Placer County, in Northern California, were booked into juvenile hall Monday after the 15-year-old's parents got a drug-testing kit from Rocklin police and tested positive for prescription sleeping medication, Rocklin & Roseville Today reports. They face charges of conspiracy and willfully mingling a pharmaceutical with food. Police said the 16-year-old provided the pills.

The 15-year-old's parents forbid her from using the Internet after 10 p.m., and the girl felt their policy was "too strict," police spokesman Lt. Lon Milka told The Sacramento Bee.

Police say the saga began Friday evening, when the 15-year-old's friend was visiting from nearby Roseville. The 15-year-old offered to get her mother and father milkshakes from an unidentified fast-food restaurant. Her parents finished only a quarter of their drinks, saying they were gritty and tasted peculiar. They nodded off about an hour later - police and news reports don't say exactly when - and came to about 1 a.m. Saturday with hangover symptoms.

After turning in for the night, they woke later in the morning with headaches and grogginess, so they went to police to pick up a $5 drug kit, which Milka said parents usually use to test their children.

He said it isn't clear what the girls did online while the parents were knocked out.

"For our investigation, that wasn't as important as the drugging with the milkshake," Milka said, adding that if they were adults "they could be facing prison time."

As is customary, the teens are not being identified publicly because they are juveniles.